diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 2faa737..c4a6f9a 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -422,6 +422,11 @@
   assert_equal('one', v1)
   assert_equal('two', v2)
   assert_equal(['three'], vrem)
+
+  [&ts, &sw] = [3, 4]
+  assert_equal(3, &ts)
+  assert_equal(4, &sw)
+  set ts=8 sw=4
 enddef
 
 def Test_assignment_vim9script()
diff --git a/src/version.c b/src/version.c
index 1ac4940..8b68bc1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1390,
+/**/
     1389,
 /**/
     1388,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 570885a..a6b4a27 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -1336,7 +1336,7 @@
     isn_T	*isn;
 
     RETURN_OK_IF_SKIP(cctx);
-    if ((isn = generate_instr(cctx, ISN_STOREOPT)) == NULL)
+    if ((isn = generate_instr_drop(cctx, ISN_STOREOPT, 1)) == NULL)
 	return FAIL;
     isn->isn_arg.storeopt.so_name = vim_strsave(name);
     isn->isn_arg.storeopt.so_flags = opt_flags;